Smells play an important role in horticulture therapy by stimulating the brain and boosting positive emotions and memories. The document describes a 4-month horticulture therapy program conducted with orphanage children and corporate employees that involved activities like herbal bouquet making, flower arrangements, and sensory games. Assessments showed the programs improved self-esteem in children and reduced stress, anxiety, and workplace stress in corporate participants, demonstrating the emotional benefits of incorporating smells and plants into horticulture therapy.